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US3253357A
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Underwater excavating device
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US3091353A
|
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Retractable unloader
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US3043029A
|
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Excavating machine notably for digging trenches
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US3019949A
|
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Hopper capable of being emptied in a regulatable manner
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US2822147A
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Guide device for boring tools
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US2805553A
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Devices for inserting posts or piles into the ground
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US2668377A
|
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Automatic grab-bucket
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US2495498A
|
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Water closet with auxiliary chamber for a cleaning brush
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US2507292A
|
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Well sinking apparatus
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US2390047A
|
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Grab used for boring wells
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US2359073A
|
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Device for lowering loads
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US2371865A
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Counterweight control system for lifting device carriages
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